Img(ImageView) moving randomly within screen with onTouch onDrag listener

Hello making an app (Android Studio) for autistic children (inspired by my autistic son). In my Activity i have 2 linear layout: Top and Bottom. The top is where 3/4 of my screen that has 4 images. The bottom is the targeted drop point where the "Answer" or img should be dropped.

I have an 4 img randomly created in a (via databaseFP iterated) but now i want those img to be moving randomly within screen (top screen) and drag them into a target drag box (bottom screen). Only 1 of four img is the correct "answer" so if its "incorrect" i want this img to return to its position MOVING all the while within screen until the "correct" img is chosen to the targeted drop box. That is all...Please Please help me i have read many and not like this specifically where it involves onTouch/onDrag listener and the img goes back to position if dragged.

So far all i have done is make the img move (it retains the on click and drag but when its incorrect it goes off screen) Pls see code below

DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int width = displaymetrics.widthPixels;
int height = displaymetrics.heightPixels;

Random r = new Random();

int distance = 100; //the distance to move in pixels
int duration = 500; //the duration of the animation in ms

double direction = Math.random() * 2 * Math.PI;

int translationX = (int) (Math.cos(direction) * distance);
int translationY = (int) (Math.sin(direction) * distance);

I am a newbie but this would help my autistic son and this is a Thesis project for my college.